From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-x230.google.com (mail-lf0-x230.google.com [IPv6:2a00:1450:4010:c07::230]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 52A0B3B29E for ; Sun, 26 Nov 2017 02:29:48 -0500 (EST) Received: by mail-lf0-x230.google.com with SMTP id i14so29372298lfc.1 for ; Sat, 25 Nov 2017 23:29:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=fIAtkANm6GtPiBHBpnS2vJaC6Uqc8W/jQs+cz3nOTVo=; b=YlyrLW07k/k+gJbEMscT3uV1HvJIC7A2TrnKygu4kt2myLd+hdxZlT78kHZBTDtnhp NSqtYse3Fbt2plMrt9HcnA/wB83rNjjHDBPO+QQbXobWXS4t9N8V/GYQgMTXl0fncuwY +qxgMpg6XzvUFSt9mRTBBmGtKdcN/6GRqqcbzFhkOsKQiygyHj3K8lH6JQqJcNseFlcz HJOMTDFg8kPIMwxDnzuoOUSs/iXuFyk0uIMV3h8xBLo55cjEvK6R/h2YrJZkqY1qe6DX 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-0800 (PST) MIME-Version: 1.0 References: <20171124092021.DC01D40605C@ip-64-139-1-69.sjc.megapath.net> In-Reply-To: From: Caleb Cushing Date: Sun, 26 Nov 2017 07:29:35 +0000 Message-ID: To: Neil Davies Cc: Hal Murray , bloat@lists.bufferbloat.net Content-Type: multipart/alternative; boundary="089e082f52201078be055eddc0a6" Subject: Re: [Bloat] Steam In Home Streaming on ath9k wifi X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 26 Nov 2017 07:29:48 -0000 --089e082f52201078be055eddc0a6 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable from desktop Pinging 192.168.1.105 with 32 bytes of data: Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms 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time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128 Ping statistics for 192.168.1.105: Packets: Sent =3D 100, Received =3D 100, Lost =3D 0 (0% loss), Approximate round trip times in milli-seconds: Minimum =3D 0ms, Maximum =3D 0ms, Average =3D 0ms C:\Users\xenot>ping -n 100 192.168.1.130 Pinging 192.168.1.130 with 32 bytes of data: Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D5ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D5ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D6ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D6ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D6ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D8ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128 Ping statistics for 192.168.1.130: Packets: Sent =3D 100, Received =3D 100, Lost =3D 0 (0% loss), Approximate round trip times in milli-seconds: Minimum =3D 3ms, Maximum =3D 8ms, Average =3D 3ms On Sun, Nov 26, 2017 at 1:25 AM Caleb Cushing wrote: > ping from laptop > > C:\Users\xeno>ping 192.168.1.105 -n 100 > > Pinging 192.168.1.105 with 32 bytes of data: > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D5ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128 > Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128 > > Ping statistics for 192.168.1.105: > Packets: Sent =3D 100, Received =3D 100, Lost =3D 0 (0% loss), > Approximate round trip times in milli-seconds: > Minimum =3D 3ms, Maximum =3D 5ms, Average =3D 3ms > > > On Fri, Nov 24, 2017 at 3:35 AM Neil Davies wrote= : > >> On 24 Nov 2017, at 09:20, Hal Murray wrote: >> >> >> neil.davies@pnsol.com said: >> >> There are a few more issues - the relative drift between the two clocks >> can be as high as 200ppm, though typically 50-75ppm is what we observe, >> but >> this drift is monotonic. >> >> >> 200 ppm seems pretty high, but not off scale. If ntpd is running and no= t >> getting confused by long queuing delays, it should correct the drift to >> well >> under 1 ppm. If you turn on loopstats, you can graph it. >> >> >> I=E2=80=99m saying that is the maximum rate of drift between two clocks = even >> when they are under NTP control. As you say below the clock rates >> are not completely stable they are temperature dependent. >> When we did this with the guys at CERN we could >> correlate the results with the workload (see below for references). >> >> We=E2=80=99ve got ~1M experiments using this approach across various net= works, >> the numbers are what we are seeing in practice. >> >> The caveat is that, after a while (i.e several 100s) the clock drift can >> make >> a significant difference (i.e a few ms) in the one-way delay estimation. >> >> >> If you are blasting the network and adding long queuing delays, ntpd can >> easily get confused. >> >> There is another quirk to keep in mind. The temperature coefficient of >> the >> crystal is ballpark of 1 ppm per C. Things can change significantly if >> an >> idle system starts flinging lots of bits around. >> >> >> Also NTP can make changes at one (or both) ends - they show up as distin= ct >> direction changes in the drift. >> >> >> I'm not sure what you mean by "direction change". I'd expect a graph of >> the >> time offset vs time to be linear and the slope would have a sharp change >> if >> ntpd changed it's "drift" correction and/or maybe a rounded bend as a >> system >> warmed up. >> >> >> Don=E2=80=99t forget you are measuring the difference in the rates betwe= en two >> NTP clocks, >> hence the change when one of the NTP systems decides to change the drift >> rate >> the relative rate can change direction. >> >> >> ---------- >> >> Are you happy with whatever you are doing? Should we try to set things >> up >> >> so ntpd works well enough? How close would you like the times to be? = =E2=80=A6 >> >> >> Yep, we=E2=80=99re very happy - we don=E2=80=99t care that there is a li= near clock drift >> (we >> can correct for that) and the step changes are infrequent and can be >> eliminated >> from the long term analysis. >> >> You might find =C2=A74.4 (esp =C2=A74.4.5) and =C2=A75.6 in >> https://cds.cern.ch/record/1504817/files/CERN-THESIS-2013-004.pdf >> interesting. It illustrates these sort of issues. >> >> >> >> >> >> -- >> These are my opinions. I hate spam. >> >> >> >> >> _______________________________________________ >> Bloat mailing list >> Bloat@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/bloat >> > -- > Caleb Cushing > > http://xenoterracide.com > --=20 Caleb Cushing http://xenoterracide.com --089e082f52201078be055eddc0a6 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
from desktop

Pinging 192.168.1.105= with 32 bytes of data:
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128
Reply from= 192.168.1.105: bytes=3D32 time<1ms= TTL=3D128
Reply from 192.168.1.= 105: bytes=3D32 time<1ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128
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Reply= from 192.168.1.105: bytes=3D32 time&l= t;1ms TTL=3D128
Reply from 192.1= 68.1.105: bytes=3D32 time<1ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D1= 28
Reply from 192.168.1.105:= bytes=3D32 time<1ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128
= Reply from 192.168.1.105: bytes=3D32 t= ime<1ms TTL=3D128
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Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D1= 28
Reply from 192.168.1.105:= bytes=3D32 time<1ms TTL=3D128
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= Reply from 192.168.1.105: bytes=3D32 t= ime<1ms TTL=3D128
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Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D1= 28
Reply from 192.168.1.105:= bytes=3D32 time<1ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128
= Reply from 192.168.1.105: bytes=3D32 t= ime<1ms TTL=3D128
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Reply from 192.168.1.105: bytes= =3D32 time<1ms TTL=3D128
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Reply = from 192.168.1.105: bytes=3D32 time<= ;1ms TTL=3D128
Reply from 192.16= 8.1.105: bytes=3D32 time<1ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D1= 28
Reply from 192.168.1.105:= bytes=3D32 time<1ms TTL=3D128
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= Reply from 192.168.1.105: bytes=3D32 t= ime<1ms TTL=3D128
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Reply from 192.16= 8.1.105: bytes=3D32 time<1ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D1= 28
Reply from 192.168.1.105:= bytes=3D32 time<1ms TTL=3D128
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= Reply from 192.168.1.105: bytes=3D32 t= ime<1ms TTL=3D128
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Reply from 192.16= 8.1.105: bytes=3D32 time<1ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D1= 28
Reply from 192.168.1.105:= bytes=3D32 time<1ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128
= Reply from 192.168.1.105: bytes=3D32 t= ime<1ms TTL=3D128
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Reply from 192.168.1.105: bytes= =3D32 time<1ms TTL=3D128
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Reply = from 192.168.1.105: bytes=3D32 time<= ;1ms TTL=3D128
Reply from 192.16= 8.1.105: bytes=3D32 time<1ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D1= 28
Reply from 192.168.1.105:= bytes=3D32 time<1ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128
= Reply from 192.168.1.105: bytes=3D32 t= ime<1ms TTL=3D128
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Reply from 192.168.1.105: bytes= =3D32 time<1ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128
Reply = from 192.168.1.105: bytes=3D32 time<= ;1ms TTL=3D128
Reply from 192.16= 8.1.105: bytes=3D32 time<1ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D1= 28
Reply from 192.168.1.105:= bytes=3D32 time<1ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128
= Reply from 192.168.1.105: bytes=3D32 t= ime<1ms TTL=3D128
Reply from = 192.168.1.105: bytes=3D32 time<1ms TTL=3D128
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Reply from 192.168.1.105= : bytes=3D32 time<1ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time<1ms TTL=3D128
=

Ping statistics for 19= 2.168.1.105:
=C2=A0 =C2=A0 Packets: Sent =3D 100, Received = =3D 100, Lost =3D 0 (0% loss),
Approximate round trip times in mi= lli-seconds:
=C2=A0 =C2=A0 Minimum =3D 0ms, Maximum =3D 0ms, Aver= age =3D 0ms

C:\Users\xenot>ping -n 100 192.168.= 1.130

Pinging 192.168.1.130 with 32 bytes of data:=
Reply from 192.168.1.130: b= ytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Repl= y from 192.168.1.130: bytes=3D32 time= =3D3ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D4ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D4ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D5ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D3ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D3ms TTL=3D128
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Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D3ms TTL=3D128
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Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D4ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D3ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D3ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D3ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D4ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D4ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D3ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D5ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D6ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D6ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D3ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D4ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D6ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D3ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D8ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D3ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D12= 8
Reply from 192.168.1.130: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D3ms TTL=3D128
Rep= ly from 192.168.1.130: bytes=3D32 time= =3D4ms TTL=3D128
Reply from 192.= 168.1.130: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.130: bytes=3D32 time=3D4ms TTL=3D12= 8

Ping statistics for 192.168.1.130:
=C2=A0 =C2=A0 Packets: Sent =3D 100, Rece= ived =3D 100, Lost =3D 0 (0% loss),
Approximate round trip times = in milli-seconds:
=C2=A0 =C2=A0 Minimum =3D 3ms, Maximum =3D 8ms,= Average =3D 3ms


On Sun, Nov 26, 2017 at 1:25 AM Caleb Cushing <xenoterracide@gmail.com> wro= te:
ping from lapt= op

C:\Users\xeno>ping 192.168.1.105 -n 100

Pinging 192.168.1.105 with 32 bytes of data:
Reply from <= a href=3D"http://192.168.1.105" target=3D"_blank">192.168.1.105: bytes= =3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128<= /div>
Reply from 192= .168.1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 = time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128
<= div>Reply from 192.168.1= .105: bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time= =3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
= Reply from 192.168.1.105= : bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms= TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply = from 192.168.1.105: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL= =3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply from= 192.168.1.105: byte= s=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128=
Reply from 19= 2.168.1.105: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32= time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128
=
Reply from 192.168.= 1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time= =3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128
= Reply from 192.168.1.105= : bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms= TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply = from 192.168.1.105: = bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL= =3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128
Reply from= 192.168.1.105: byte= s=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128=
Reply from 19= 2.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32= time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
=
Reply from 192.168.= 1.105: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time= =3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
= Reply from 192.168.1.105= : bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms= TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply = from 192.168.1.105: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL= =3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply from= 192.168.1.105: byte= s=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128=
Reply from 19= 2.168.1.105: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32= time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
=
Reply from 192.168.= 1.105: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time= =3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
= Reply from 192.168.1.105= : bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms= TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply = from 192.168.1.105: = bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL= =3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply from= 192.168.1.105: byte= s=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128=
Reply from 19= 2.168.1.105: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32= time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128
=
Reply from 192.168.= 1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time= =3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128
= Reply from 192.168.1.105= : bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms= TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D5ms TTL=3D128
Reply = from 192.168.1.105: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL= =3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply from= 192.168.1.105: byte= s=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128=
Reply from 19= 2.168.1.105: bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32= time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
=
Reply from 192.168.= 1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time= =3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128
= Reply from 192.168.1.105= : bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms= TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply = from 192.168.1.105: = bytes=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL= =3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply from= 192.168.1.105: byte= s=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128=
Reply from 19= 2.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32= time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128
=
Reply from 192.168.= 1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time= =3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128
= Reply from 192.168.1.105= : bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms= TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL=3D128
Reply = from 192.168.1.105: = bytes=3D32 time=3D3ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D4ms TTL= =3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128
Reply from= 192.168.1.105: byte= s=3D32 time=3D4ms TTL=3D128
Reply from 192.168.1.105: bytes=3D32 time=3D3ms TTL=3D128=

Ping statistics for 192.168.1.105:
=C2=A0 =C2=A0 Packets: S= ent =3D 100, Received =3D 100, Lost =3D 0 (0% loss),
Approximate = round trip times in milli-seconds:
=C2=A0 =C2=A0 Minimum =3D 3ms,= Maximum =3D 5ms, Average =3D 3ms


On Fri, Nov 24, 2017 at 3:35 AM Neil Davies <<= a href=3D"mailto:neil.davies@pnsol.com" target=3D"_blank">neil.davies@pnsol= .com> wrote:
On 24 Nov 2017, at= 09:20, Hal Murray <hmurray@megapathdsl.net> wrote:


= neil.davies@pnso= l.com said:
There are a few more issues - = the relative drift between the two clocks
can be as high as 200ppm, thou= gh typically 50-75ppm is what we observe, but
this drift is monotonic.

200 ppm seems pretty high, but not off scale.=C2=A0 If n= tpd is running and not
getting confused by long queuing delays, it shou= ld correct the drift to well
under 1 ppm.=C2=A0 If you turn on loopstat= s, you can graph it.

I=E2=80=99m saying that is t= he maximum rate of drift between two clocks even
when they are un= der NTP control. As you say below the clock rates
are not complet= ely stable they are temperature dependent.
When we did this with = the guys at CERN we could
correlate the results with the workload= (see below for references).

We=E2=80=99ve got ~1M= experiments using this approach across various networks,=C2=A0
t= he numbers are what we are seeing in practice.=C2=A0

The caveat is that, after a while (i.e several 100s) the clock drift can= make
a significant difference (i.e a few ms) in the one-way dela= y estimation.=C2=A0


If you are blasting the netw= ork and adding long queuing delays, ntpd can
easily get confused.
There is another quirk to keep in mind.=C2=A0 The temperature coefficient= of the
crystal is ballpark of 1 ppm per C.=C2=A0 Things can change sig= nificantly if an
idle system starts flinging lots of bits around.

Also NTP can make changes at one (or both) = ends - they show up as distinct
direction changes in the drift.

I'm not sure what you mean by "direction change"= .=C2=A0 I'd expect a graph of the
time offset vs time to be linear = and the slope would have a sharp change if
ntpd changed it's "= drift" correction and/or maybe a rounded bend as a system
warmed u= p.

Don=E2=80=99t forget you are measuring the differen= ce in the rates between two NTP clocks,
hence the change when one= of the NTP systems decides to change the drift rate
the relative= rate can change direction.


----------

= Are you happy with whatever you are doing? =C2=A0=C2=A0Should we try to set= things up
so ntpd works well en= ough?=C2=A0 How close would you like the times to be? =C2=A0=E2=80=A6

Yep, we=E2=80=99re very happy - we don=E2=80= =99t care that there is a linear clock drift (we
can correct for = that) and the step changes are infrequent and can be eliminated
f= rom the long term analysis.

You might find =C2=A74= .4 (esp =C2=A74.4.5) and =C2=A75.6 in=C2=A0
interesting.=C2=A0 It illustrates these sort of issues.=C2=A0





--
These are my opinions.=C2= =A0 I hate spam.




__= _____________________________________________
Bloat mailing list
Bloat@list= s.bufferbloat.net
https://lists.bufferbloat.net/listinfo/bloat
--
--
<= /div>
--089e082f52201078be055eddc0a6--